package net.xdclass.until;

import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.security.MessageDigest;
import java.util.*;
import java.util.stream.Collectors;

@Slf4j
public class CommonUtil {
    /**
     * 获取ip
     *
     * @param request
     * @return
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ipAddress = null;
        try {
            ipAddress = request.getHeader("x-forwarded-for");
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getHeader("WL-Proxy-Client-IP");
            }
            if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
                ipAddress = request.getRemoteAddr();
                if (ipAddress.equals("127.0.0.1")) {
                    // 根据网卡取本机配置的IP
                    InetAddress inet = null;
                    try {
                        inet = InetAddress.getLocalHost();
                    } catch (UnknownHostException e) {
                        e.printStackTrace();
                    }
                    ipAddress = inet.getHostAddress();
                }
            }
            // 对于通过多个代理的情况，第一个IP为客户端真实IP,多个IP按照','分割
            if (ipAddress != null && ipAddress.length() > 15) {
                // "***.***.***.***".length()
                // = 15
                if (ipAddress.indexOf(",") > 0) {
                    ipAddress = ipAddress.substring(0, ipAddress.indexOf(","));
                }
            }
        } catch (Exception e) {
            ipAddress = "";
        }
        return ipAddress;
    }

    public static String MD5(String data) {
        try {
            java.security.MessageDigest md = MessageDigest.getInstance("MD5");
            byte[] array = md.digest(data.getBytes("UTF-8"));
            StringBuilder sb = new StringBuilder();
            for (byte item : array) {
                sb.append(Integer.toHexString((item & 0xFF) | 0x100).substring(1, 3));
            }

            return sb.toString().toUpperCase();
        } catch (Exception exception) {
        }
        return null;
    }

    public static String getRandomCode(int length) {
        String sources = "0123456789";
        Random random = new Random();
        StringBuilder stringBuilder = new StringBuilder();
        for (int i = 0; i < length; i++) {
            stringBuilder.append(sources.charAt(random.nextInt(9)));
        }
        return stringBuilder.toString();
    }

    public static long getCurrentTimestamp() {
        return new Date().getTime();
    }

    public static String generateUUID() {
        return UUID.randomUUID().toString().replaceAll("-", "").substring(0, 32);
    }

    /**
     * 生成指定长度随机字母和数字
     *
     * @param length
     * @return
     */
    private static final String ALL_CHAR_NUM = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

    public static String getStringNumRandom(int length) {
        //生成随机数字和字母,
        Random random = new Random();
        StringBuilder saltString = new StringBuilder(length);
        for (int i = 1; i <= length; ++i) {
            saltString.append(ALL_CHAR_NUM.charAt(random.nextInt(ALL_CHAR_NUM.length())));
        }
        return saltString.toString();
    }

    public static void sendJsonMessage(HttpServletResponse response, Object obj) {
        ObjectMapper objectMapper = new ObjectMapper();
        response.setContentType("application/json; charset=utf-8");
        try (PrintWriter writer = response.getWriter();) {
            writer.println(objectMapper.writeValueAsString(obj));
            response.flushBuffer();
        } catch (IOException e) {
            e.printStackTrace();
            log.warn("响应json数据给前端异常:{}", e);
        }
    }
    /**
     * 将request中的参数转换成Map
     * @param request
     * @return
     */
    public static Map<String, String> convertRequestParamsToMap(HttpServletRequest request) {
        Map<String, String> paramsMap = new HashMap<>(16);
        Set<Map.Entry<String, String[]>> entrySet = request.getParameterMap().entrySet();

        for (Map.Entry<String, String[]> entry : entrySet) {
            String name = entry.getKey();
            String[] values = entry.getValue();
            int size = values.length;
            if (size == 1) {
                paramsMap.put(name, values[0]);
            } else {
                paramsMap.put(name, "");
            }
        }
        System.out.println(paramsMap);
        return paramsMap;
    }

    public static <S> Map<String, Object> beanProcess(Page<S> input, Class cl) {

        HashMap<String, Object> pageMap = new HashMap<>(3);
        pageMap.put("total_record", input.getTotal());
        pageMap.put("total_page", input.getPages());
        pageMap.put("current_data", input.getRecords().stream().map(
                obj -> {
                    Object o = null;
                    try {
                        o = cl.newInstance();
                    } catch (InstantiationException e) {
                        e.printStackTrace();
                    } catch (IllegalAccessException e) {
                        e.printStackTrace();
                    }
                    BeanUtils.copyProperties(obj, o, cl);
                    return o;
                }
        ).collect(Collectors.toList()));
        return pageMap;
    }
}
